If you got to this page directly, you may want to know that the underlying data and trends are discussed more fully at this page.
This work is licensed under a
Creative Commons License.
R. Chung
Place the mouse pointer over the image below to see trends in the residuals. In each panel, the residuals are calculated as the difference from what the trend would be if those polls were omitted, i.e., for Gallup, the trend is based on all polls except for the Gallup polls.
If you got to this page directly, you may want to know that the underlying data and trends are discussed more fully at this page.